Transport of sucrose, not hexose, in the phloem.

Journal of Experimental Botany
David D LiuRobert Turgeon

Abstract

Several lines of evidence indicate that glucose and fructose are essentially absent in mobile phloem sap. However, this paradigm has been called into question, especially but not entirely, with respect to species in the Ranunculaceae and Papaveraceae. In the experiments in question, phloem sap was obtained by detaching leaves and placing the cut ends of the petioles in an EDTA solution. More hexose than sucrose was detected. In the present study, these results were confirmed for four species. However, almost identical results were obtained when the leaf blades were removed and only petiole stubs were immersed. This suggests that the sugars in the EDTA solution represent compounds extracted from the petioles, rather than sugars in transit in the phloem. In further experiments, the leaf blades were exposed to (14)CO(2) and, following a chase period, radiolabelled sugars in the petioles and EDTA exudate were identified. Almost all the radiolabel was in the form of [(14)C]sucrose, with little radiolabelled hexose. The data support the long-held contention that sucrose is a ubiquitous transport sugar, but hexoses are essentially absent in the phloem stream.

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Citations

Jan 11, 2013·Plant Physiology·Pia Guadalupe DominguezFernando Carrari
Mar 5, 2014·Journal of Experimental Botany·Michael KnoblauchWinfried S Peters
Apr 23, 2013·Plant Science : an International Journal of Experimental Plant Biology·Ulrich Kutschera, Karl J Niklas
May 27, 2015·Trends in Plant Science·Joerg Fettke, Alisdair R Fernie
Jun 1, 2016·Frontiers in Plant Science·Amol Fatangare, Aleš Svatoš
Dec 15, 2016·Environmental Science and Pollution Research International·Hanxiang WuJean-François Chollet
Dec 25, 2012·Annals of Botany·Raquel dos SantosWim Van den Ende
Feb 20, 2016·Scientific Reports·You-Zhi LiBao-Shan Chen
Nov 1, 2017·Journal of Experimental Botany·Hanxiang WuJean-Louis Bonnemain
Dec 28, 2017·Journal of Experimental Botany·Zi-Chen WuHui-Cong Wang
Dec 21, 2017·F1000Research·Johannes Liesche, John Patrick
Jun 23, 2018·Tree Physiology·Masako DannouraDominique Gérant
Apr 9, 2019·Journal of Experimental Botany·Li-Hsuan HoWoei-Jiun Guo
Dec 15, 2018·Tree Physiology·Millicent R Smith, A Merchant
Mar 11, 2016·Tree Physiology·Andrew Merchant
Mar 3, 2020·Frontiers in Plant Science·Shunya Saito, Nobuyuki Uozumi
Jun 18, 2020·Scientific Reports·Rafael Pablo LozanoEnrique Peñalver
Jun 14, 2020·Plants·Chao Xia, Cankui Zhang
Feb 15, 2021·Physiologia Plantarum·Harmeet KaurPrafull Salvi
Jul 17, 2021·Plant, Cell & Environment·Francesco MignolliMaría Laura Vidoz
Sep 23, 2021·Annals of Botany·Laura Kathrine PerbyAngelika Mustroph

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Methods Mentioned

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